Spot size and pulse number dependence of femtosecond laser ablation thresholds of silicon and stainless steel

Armbruster, Oskar; Naghilou, Aida; Kitzler, Markus; Kautek, Wolfgang

doi:10.1016/j.apsusc.2016.11.229

Cited by 75 publications

(38 citation statements)

References 37 publications

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“…The mistake would be to optimise pulse energy to find the highest ablation efficiency and optimum fluence than use maximum average power from the laser to reach the highest ablation rate by increasing the spot size to maintain the optimum fluence. When the beam size on the sample surface is increased, the ablation threshold F th is decreased due to the possibility for laser radiation to hit a defect 20,21 , meaning that the optimum fluence F opt may shift down. According to the ablation model, the optimal and threshold fluences are interrelated 6 :…”

Section: Resultsmentioning

confidence: 99%

Highly-efficient laser ablation of copper by bursts of ultrashort tuneable (fs-ps) pulses

Žemaitis

Gečys

Barkauskas³

et al. 2019

Sci Rep

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Ultrashort pulse laser, capable of varying pulse duration between 210 fs and 10 ps and producing a burst of pulses with an intra-burst pulse repetition rate of 64.5 MHz (time distance between pulses 15.5 ns), was used to investigate the ablation efficiency of the copper. The study on ablation efficiency was done for various numbers of pulses per burst between 1 and 40. The increase in the ablation efficiency by 20% for 3 pulses per burst compared to a non-burst regime was observed. The comparison was made between the beam-size optimised regimes. Therefore, the real advantage of the burst regime was demonstrated. To the best of our knowledge, we report the highest laser milling ablation efficiency of copper of 4.84 µm 3 /µJ by ultrashort pulses at ~1 µm optical wavelength.

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Section: Resultsmentioning

confidence: 99%

Highly-efficient laser ablation of copper by bursts of ultrashort tuneable (fs-ps) pulses

Žemaitis

Gečys

Barkauskas³

et al. 2019

Sci Rep

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“…Sixty discs (10 mm diameter x1.2 mm thickness) were cut from cylinders which were milled from zirconia blanks; these dimensions were chosen In order to standardize the dimension with biaxial flexural test according to ISO:6872 (26) . Sintering of the specimens was done according to the manufacturers recommendation at high temperature furnace at 1450ᵒC according to ISO 13356:2015 (27) , to generate dense structures, as dense material prevent penetration of the water Phase Transformation, Surface Topography and Mechanical Properties of Hydrothermal Aged (223) to bulk of the material.. However, increasing the sintering temperature above 1550ᵒC, lead to formation of large grain, pores and surface cracks and water penetertation, hence,be more susceptable to LTD (28) .…”

Section: Discussionmentioning

confidence: 99%

Phase Transformation, Surface Topography and Mechanical Properties of Hydrothermal Aged Laser treated Cubic Versus Tetragonal Zirconia Ceramics

et al. 2020

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Purpose: This study was carried out to compare the effect of laser surface treatment on cubic and tetragonal zirconia ceramics regarding; phase transformation tetragonal-monoclinic (T-M), surface topography, mechanical properties and biaxial flexural strength before and after low thermal degradation (LTD) aging. Materials and Methods: sixty discs (N=60) of CAD/CAM zirconia were used in this study. These specimens were divided into two main groups according to type of zirconia. Group I: (n=30) Cubic Zirconia (DD cubeX 2), while Group II: (n=30) Tetragonal zirconia (Superfect-Zir). Then each group further subdivided into two subgroups according to surface treatment, subgroup (1): control without surface treatment, subgroup (2): laser surface treatment .Specimens form each subgroups were tested for the following; Phase transformation, surface topography, and mechanical properties before and after Low Thermal Degradation (LTD) aging test. Results: Statistical analysis revealed that there was a statistical significant difference between the two tested groups regarding the surface topography, biaxial flexural strength, and surface hardness. Also there was a statistical significant difference regarding the surface treatment and before/after LTD and laser among the tested zirconia ceramics. Conclusions: laser surface treatment improved the properties of tetragonal / cubic zirconia, and increases their resistance to low thermal degradation LTD aging.

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“…The majority of reports describe ablation characteristics measured at fixed spot size, very limited number of studies investigating the dependence of the ablation properties on spot size can be found [20,21,22]. The study proving the phenomenon of spot size dependence of ablation characteristics for fused silica was carried out only in a limited range of beam radii of less than 10 µm [23].…”

Section: Discussionmentioning

confidence: 99%

Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses

Andrásik

Flender

Budai

et al. 2019

Short-Pulse High-Energy Lasers and Ultrafast Optical Technologies

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Spot size and pulse number dependence of femtosecond laser ablation thresholds of silicon and stainless steel

Cited by 75 publications

References 37 publications

Highly-efficient laser ablation of copper by bursts of ultrashort tuneable (fs-ps) pulses

Highly-efficient laser ablation of copper by bursts of ultrashort tuneable (fs-ps) pulses

Phase Transformation, Surface Topography and Mechanical Properties of Hydrothermal Aged Laser treated Cubic Versus Tetragonal Zirconia Ceramics

Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses

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